Format ThemePicker .kt files am: 2351412212

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/20114531

Change-Id: Ied33854fb4370984d230dc4da3e609e7bdbd42f1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>